| Election Name: | 1934 United States Senate elections in Wyoming |
| Country: | Wyoming |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1928 United States Senate election in Wyoming |
| Previous Year: | 1928 |
| Next Election: | 1940 United States Senate election in Wyoming |
| Next Year: | 1940 |
| Election Date: | November 6, 1934 |
| Image1: | Sen. Joseph O'Mahoney, LCCN2016876768 (cropped).jpg |
| Nominee1: | Joseph C. O'Mahoney |
| Party1: | Democratic Party (United States) |
| Popular Vote1: | 53,806 |
| Percentage1: | 56.62% |
| Nominee2: | Vincent Carter |
| Party2: | Republican Party (United States) |
| Popular Vote2: | 40,819 |
| Percentage2: | 42.96% |
| Map Size: | 250px |
| U.S. Senator | |
| Before Election: | Joseph C. O'Mahoney |
| Before Party: | Democratic Party (United States) |
| After Election: | Joseph C. O'Mahoney |
| After Party: | Democratic Party (United States) |
The 1934 United States Senate elections in Wyoming took place on November 6, 1934. Incumbent Democratic Senator John B. Kendrick died on November 3, 1933, and Joseph C. O'Mahoney was appointed by Governor Leslie A. Miller as Kendrick's replacement. Two elections for the same Senate seat were held on the same day; one as a special election to fill the remainder of Kendrick's original six-year term, and another to select a Senator to serve the next six-year term. O'Mahoney ran for re-election in both elections. He was opposed by Republican Congressman Vincent Carter. Aided by the strong performance by the Democratic Party throughout the country in 1934, and by Governor Miller's landslide re-election, O'Mahoney handily defeated Carter to win re-election.